关键词: 氨水, 二氧化碳, 吸收, 规整填料, 体积总传质系数

Abstract: By far, the emission of CO₂ has become a key challenge for the sustainable development in the world.Amongst the CO₂ capture techniques, post-combustion decarbonization, which bases on the mature state of art of chemical solvent absorption process, is currently the only one that has access to the industrial test.And aqua ammonia, as a new, alternative absorbent, has attracted much attention in recent years.In this study, the gas phase volumetric overall mass transfer coefficients of dilute CO₂ absorption into aqueous ammonia（K_Ga_e)were measured to explore the mass-transfer performance in a structured packed column.The K_Ga_e value was evaluated over the ranges of main operating variables：gas flow rate, CO₂ partial pressure, liquid loading, and ammonia concentration.The results show that higher liquid loading of aqueous ammonia is beneficial to enhance the K_Ga_e value.On the contrary, K_Ga_e decreases as the CO₂ partial pressure increases.Gas loading has little influence on K_Ga_e.The experimental results are useful to guide the future work on the packed column design.

Key words: aqua ammonia, carbon dioxide, absorption, structured packing, volumetric overall mass transfer coefficient